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Submission #94653

# Submission time Handle Problem Language Result Execution time Memory
94653 2019-01-22T06:45:16 Z andy627 Race (IOI11_race) C++17
100 / 100
 1273 ms 38760 KB 
#include <stdio.h>
#include <vector>
#include <set>
#include <algorithm>
#define pii pair<int,int>
#define ff first
#define ss second
#define INF 1e9
using namespace std;

int n,k;
vector<pii> edge[222222];
int siz[222222];

set<int> st;
vector<pii> vc;
int cnt[1111111];
bool is_cent[222222];

int ans=INF;

int dfs_siz(int v,int p){
	siz[v]=1;
	for(pii u:edge[v]){
		if(u.ff==p || is_cent[u.ff]) continue;
		siz[v]+=dfs_siz(u.ff,v);
	}
	return siz[v];
}

int cent(int rt){
	int v=rt,p=rt;
	
	while(1){
		int mx=-1,mxi;
		for(pii u:edge[v]){
			if(u.ff==p || is_cent[u.ff]) continue;
			if(mx<siz[u.ff]){
				mx=siz[u.ff];
				mxi=u.ff;
			}
		}
		if(mx==-1 || mx<=siz[rt]/2) break;
		p=v; v=mxi;
	}
	return v;
}

void dfs_dist(int v,int p,int dist1,int dist2){
	vc.push_back({dist1,dist2});

	for(pii u:edge[v]){
		if(u.ff==p || is_cent[u.ff]) continue;
		if(dist1+u.ss<=k) dfs_dist(u.ff,v,dist1+u.ss,dist2+1);
	}
}

void cent_dnc(int v){
	dfs_siz(v,v);
	v=cent(v); is_cent[v]=1;

	//printf("%d\n",v);

	st.clear();
	st.insert(0); cnt[0]=0;
	for(pii u:edge[v]){
		if(is_cent[u.ff] || u.ss>k) continue;

		vc.clear();
		dfs_dist(u.ff,v,u.ss,1);

		//for(pii dist:vc) printf("%d %d\n",dist.ff,dist.ss);

		for(pii dist:vc){
			if(st.find(k-dist.ff)!=st.end()) ans=min(ans,cnt[k-dist.ff]+dist.ss);
		}

		for(pii dist:vc){
			if(st.find(dist.ff)==st.end()){
				st.insert(dist.ff);
				cnt[dist.ff]=dist.ss;
			}
			else cnt[dist.ff]=min(cnt[dist.ff],dist.ss);
		}

		//printf("%d\n\n",ans);
	}

	for(pii u:edge[v]){
		if(is_cent[u.ff]) continue;
		cent_dnc(u.ff);
	}
}

int best_path(int N, int K, int H[][2], int L[]){
	n=N; k=K;

	for(int i=0;i<n-1;i++){
		edge[H[i][0]].push_back({H[i][1],L[i]});
		edge[H[i][1]].push_back({H[i][0],L[i]});
	}

	cent_dnc(0);

	if(ans==INF) return -1;
	return ans;
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5496 KB Output is correct
2 Correct 6 ms 5624 KB Output is correct
3 Correct 5 ms 5596 KB Output is correct
4 Correct 5 ms 5596 KB Output is correct
5 Correct 6 ms 5624 KB Output is correct
6 Correct 5 ms 5624 KB Output is correct
7 Correct 4 ms 5624 KB Output is correct
8 Correct 5 ms 5624 KB Output is correct
9 Correct 5 ms 5624 KB Output is correct
10 Correct 5 ms 5496 KB Output is correct
11 Correct 5 ms 5496 KB Output is correct
12 Correct 5 ms 5624 KB Output is correct
13 Correct 5 ms 5496 KB Output is correct
14 Correct 5 ms 5624 KB Output is correct
15 Correct 5 ms 5624 KB Output is correct
16 Correct 5 ms 5624 KB Output is correct
17 Correct 6 ms 5624 KB Output is correct
18 Correct 5 ms 5624 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5496 KB Output is correct
2 Correct 6 ms 5624 KB Output is correct
3 Correct 5 ms 5596 KB Output is correct
4 Correct 5 ms 5596 KB Output is correct
5 Correct 6 ms 5624 KB Output is correct
6 Correct 5 ms 5624 KB Output is correct
7 Correct 4 ms 5624 KB Output is correct
8 Correct 5 ms 5624 KB Output is correct
9 Correct 5 ms 5624 KB Output is correct
10 Correct 5 ms 5496 KB Output is correct
11 Correct 5 ms 5496 KB Output is correct
12 Correct 5 ms 5624 KB Output is correct
13 Correct 5 ms 5496 KB Output is correct
14 Correct 5 ms 5624 KB Output is correct
15 Correct 5 ms 5624 KB Output is correct
16 Correct 5 ms 5624 KB Output is correct
17 Correct 6 ms 5624 KB Output is correct
18 Correct 5 ms 5624 KB Output is correct
19 Correct 6 ms 5624 KB Output is correct
20 Correct 6 ms 5496 KB Output is correct
21 Correct 7 ms 5624 KB Output is correct
22 Correct 8 ms 8056 KB Output is correct
23 Correct 8 ms 7800 KB Output is correct
24 Correct 9 ms 8440 KB Output is correct
25 Correct 9 ms 7416 KB Output is correct
26 Correct 8 ms 6904 KB Output is correct
27 Correct 6 ms 5624 KB Output is correct
28 Correct 8 ms 6392 KB Output is correct
29 Correct 8 ms 6904 KB Output is correct
30 Correct 8 ms 7032 KB Output is correct
31 Correct 9 ms 7420 KB Output is correct
32 Correct 9 ms 7544 KB Output is correct
33 Correct 10 ms 8312 KB Output is correct
34 Correct 9 ms 7928 KB Output is correct
35 Correct 9 ms 8572 KB Output is correct
36 Correct 9 ms 8952 KB Output is correct
37 Correct 9 ms 7544 KB Output is correct
38 Correct 8 ms 6776 KB Output is correct

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5496 KB Output is correct
2 Correct 6 ms 5624 KB Output is correct
3 Correct 5 ms 5596 KB Output is correct
4 Correct 5 ms 5596 KB Output is correct
5 Correct 6 ms 5624 KB Output is correct
6 Correct 5 ms 5624 KB Output is correct
7 Correct 4 ms 5624 KB Output is correct
8 Correct 5 ms 5624 KB Output is correct
9 Correct 5 ms 5624 KB Output is correct
10 Correct 5 ms 5496 KB Output is correct
11 Correct 5 ms 5496 KB Output is correct
12 Correct 5 ms 5624 KB Output is correct
13 Correct 5 ms 5496 KB Output is correct
14 Correct 5 ms 5624 KB Output is correct
15 Correct 5 ms 5624 KB Output is correct
16 Correct 5 ms 5624 KB Output is correct
17 Correct 6 ms 5624 KB Output is correct
18 Correct 5 ms 5624 KB Output is correct
19 Correct 204 ms 12252 KB Output is correct
20 Correct 201 ms 12280 KB Output is correct
21 Correct 206 ms 12528 KB Output is correct
22 Correct 186 ms 12724 KB Output is correct
23 Correct 122 ms 12740 KB Output is correct
24 Correct 95 ms 12464 KB Output is correct
25 Correct 210 ms 14208 KB Output is correct
26 Correct 101 ms 16940 KB Output is correct
27 Correct 277 ms 19372 KB Output is correct
28 Correct 506 ms 27512 KB Output is correct
29 Correct 455 ms 26836 KB Output is correct
30 Correct 275 ms 19320 KB Output is correct
31 Correct 257 ms 19380 KB Output is correct
32 Correct 240 ms 19544 KB Output is correct
33 Correct 432 ms 18168 KB Output is correct
34 Correct 297 ms 19000 KB Output is correct

Subtask #4
57.0 / 57.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5496 KB Output is correct
2 Correct 6 ms 5624 KB Output is correct
3 Correct 5 ms 5596 KB Output is correct
4 Correct 5 ms 5596 KB Output is correct
5 Correct 6 ms 5624 KB Output is correct
6 Correct 5 ms 5624 KB Output is correct
7 Correct 4 ms 5624 KB Output is correct
8 Correct 5 ms 5624 KB Output is correct
9 Correct 5 ms 5624 KB Output is correct
10 Correct 5 ms 5496 KB Output is correct
11 Correct 5 ms 5496 KB Output is correct
12 Correct 5 ms 5624 KB Output is correct
13 Correct 5 ms 5496 KB Output is correct
14 Correct 5 ms 5624 KB Output is correct
15 Correct 5 ms 5624 KB Output is correct
16 Correct 5 ms 5624 KB Output is correct
17 Correct 6 ms 5624 KB Output is correct
18 Correct 5 ms 5624 KB Output is correct
19 Correct 6 ms 5624 KB Output is correct
20 Correct 6 ms 5496 KB Output is correct
21 Correct 7 ms 5624 KB Output is correct
22 Correct 8 ms 8056 KB Output is correct
23 Correct 8 ms 7800 KB Output is correct
24 Correct 9 ms 8440 KB Output is correct
25 Correct 9 ms 7416 KB Output is correct
26 Correct 8 ms 6904 KB Output is correct
27 Correct 6 ms 5624 KB Output is correct
28 Correct 8 ms 6392 KB Output is correct
29 Correct 8 ms 6904 KB Output is correct
30 Correct 8 ms 7032 KB Output is correct
31 Correct 9 ms 7420 KB Output is correct
32 Correct 9 ms 7544 KB Output is correct
33 Correct 10 ms 8312 KB Output is correct
34 Correct 9 ms 7928 KB Output is correct
35 Correct 9 ms 8572 KB Output is correct
36 Correct 9 ms 8952 KB Output is correct
37 Correct 9 ms 7544 KB Output is correct
38 Correct 8 ms 6776 KB Output is correct
39 Correct 204 ms 12252 KB Output is correct
40 Correct 201 ms 12280 KB Output is correct
41 Correct 206 ms 12528 KB Output is correct
42 Correct 186 ms 12724 KB Output is correct
43 Correct 122 ms 12740 KB Output is correct
44 Correct 95 ms 12464 KB Output is correct
45 Correct 210 ms 14208 KB Output is correct
46 Correct 101 ms 16940 KB Output is correct
47 Correct 277 ms 19372 KB Output is correct
48 Correct 506 ms 27512 KB Output is correct
49 Correct 455 ms 26836 KB Output is correct
50 Correct 275 ms 19320 KB Output is correct
51 Correct 257 ms 19380 KB Output is correct
52 Correct 240 ms 19544 KB Output is correct
53 Correct 432 ms 18168 KB Output is correct
54 Correct 297 ms 19000 KB Output is correct
55 Correct 23 ms 6392 KB Output is correct
56 Correct 19 ms 6392 KB Output is correct
57 Correct 124 ms 13012 KB Output is correct
58 Correct 52 ms 12140 KB Output is correct
59 Correct 276 ms 20888 KB Output is correct
60 Correct 1273 ms 38760 KB Output is correct
61 Correct 317 ms 19832 KB Output is correct
62 Correct 354 ms 19676 KB Output is correct
63 Correct 411 ms 19704 KB Output is correct
64 Correct 1048 ms 26156 KB Output is correct
65 Correct 250 ms 20344 KB Output is correct
66 Correct 947 ms 29660 KB Output is correct
67 Correct 175 ms 20200 KB Output is correct
68 Correct 501 ms 26516 KB Output is correct
69 Correct 486 ms 26472 KB Output is correct
70 Correct 505 ms 25640 KB Output is correct